drm/radeon: fix a bug with the ring syncing code
Rings need to lock in order, otherwise
the ring subsystem can deadlock.
v2: fix error handling and number of locked doublewords.
v3: stop creating unneeded semaphores.
Signed-off-by: Christian König <deathsimple@vodafone.de>
Reviewed-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 794182a..f7372c4 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -460,6 +460,10 @@
struct radeon_semaphore *semaphore);
void radeon_semaphore_emit_wait(struct radeon_device *rdev, int ring,
struct radeon_semaphore *semaphore);
+int radeon_semaphore_sync_rings(struct radeon_device *rdev,
+ struct radeon_semaphore *semaphore,
+ bool sync_to[RADEON_NUM_RINGS],
+ int dst_ring);
void radeon_semaphore_free(struct radeon_device *rdev,
struct radeon_semaphore *semaphore);